Efficacy of a computerized shade selection systemin matching anterior metal-ceramic crowns. A double-blind clinical pilot study.
A.J. Raigrodski and G.J. Chiche: Louisiana State University, New Orleans, LA
Objectives: To determine whether anterior crowns fabricated using a computerized shade selection system (ShadeScan,TM Cynovad) (experimental procedure) match adjacent teeth better than anterior crowns fabricated using conventional shade prescription and slides with Vita Lumin shade guide (control). Methods: Five subjects, requiring a crown on a maxillary central incisor, were assigned to the study. Two crowns were fabricated for each subject. Shade for either the first or second crown was selected randomly using either the experimental procedure or the control. The ceramist fabricated the first crown using data obtained from experimental procedure, and the second using the control. The duration of each shade selection procedure was recorded as well. Each crown was tried-in in a double-blind manner and subjectively evaluated for match to the adjacent teeth with modified Ryge criteria. Crowns were rated using an ordinal scale as either Romeo (excellent), Sierra (acceptable), Tango (unacceptable), or Victor (failure). Results: The table demonstrates ratings:
Data was analyzed within each subject at the significance level of alpha=0.05.Fisher's exact test showed no statistically significant difference in color matching between the experimental and control procedures. The duration of the control procedure was 14.4 ± 5 minutes, and the experimental procedure was 5.2 ± 3.3 minutes. A paired t-test showed the difference was significant (p=0.0045). Conclusion: Matching level of crowns fabricated with the ShadeScan system was not different from crowns fabricated using the control. It took significantly less time to record the shade with the ShadeScan. Further studies are required using an adequate sample.
Supported by a research grant from Cynovad.
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